Fungicidal composition and methods of applying



Unite States Patent 2,777,793 Patented Jan. 15, 1957 FUNGICIDAL COMPOSITION AND METHODS OF APPLYING Clifton R. Neumoyer, Ambler, Pa., assignor to The Pennsylvania Salt Manufacturing Company, Philadelphia, Pa., a corporation of Pennsylvania No Drawing. Application April 2, 1953, Serial No. 346,514

7 Claims. (Cl. 167-30) This invention relates to the use of S-chloro-Z-hydroxy-a(trichloromethyDbenzyl alcohol as a fungicide.

gypsum. This composition may be made water-wettable, if desired, by the addition of a surfactant, such as one of those listed by McCutcheon, J. W., Soap and Sanitary Chemicals, August, September, and October, 1949.

The active compound may also be dissolved in a solvent such as alcohol or acetone and emulsified in Water with the addition of any of the well-known emulsifying agents alkylaryl-sulfonate;

polyether alcohol; Nonic 218, which is a polyethylene glycol tert-dodecylthio-ether; lgepon AP, which is an ester sodium isethionate; and Triton X-l55, which is an alkylaryl polyether alcohol.

non-phytotoxic solvents for the active compound.

The invention will be further illustrated by reference to the following specific examples:

Example I Slide germination tests for fungicidal activity against fungus spores were made according to the method of the American Phytopathological Society (American Phytopathological Society, Committee on Standardization of Fungicide Tests, Phytopath. 33 (7) 627-632 (1943)), as modified by Miller, H. J. (Miller, H. 1., Modifications of tion in an atmosphere of 100% humidity for twenty-four hours, the number of spores inhibited from germination is counted and the percentage inhibition in probits is plotted against the log of the concentration. The con- Foliage Diseases.

centration of deposit on the line which inhibited 50% of the spores is the ED 50 value. An ED 50 value of less than 0.1 is rated as AA, 0.1-1.0 as A, Lil-10.0 as B, and so forth. fungicidal properties, while a D rating indicates no fungicidal properties.

rating to this compound thereby indicating a high fungicidal activity against the following fungus organisms: fructicola, Venturia inaequalis, and Alternaria Example 2 Additional tests on the fungicidal properties of the compound 5-chloro-2-hydroxy-a-(trichloromethyl)benzyl alcohol were conducted with late blight (Phytophthora a greenhouse.

A. et al., Method of Evaluating 93-134 (1943)), Where replicated potted tomato plants are sprayed with a 0.2% by Weight concentration of the test compound as an emulsion in water. The disease control efiiciency of the test compound is determined by inoculating the plants with a spore suspension of the causal organism and incubating the organism under suitable conditions for the infection to take place. A count is then an AA fungicide; 0.53%, A; 3.0l5%, B; l575%, C; 100%, D.

The compound 5 chloro 2 hYdlOXY-oc-(UlChlOl'O- rnethyl)benzyi alcohol had a B rating in this test, indieating activity for the control of late blight.

acre, at normal intervals.

4. The method of claim 7 in which the active ingredient is applied at a rate between about 1 to 3 pounds per acre, calculated on the basis of a field of plants spaced at normal intervals.

swans References: Cited in the file of thispatcnt UNITED STATES PATENTS 2,477,978 Graenacher Aug. 2, 1949 FOREIGN PATENTS 141,159 Austria Mar. 25, 1935 OTHER" REFERENCES March'et al.: Journ; Econ. Ent, v01; 45, pp. 851-860,

10 October 1952.

Cristol et alfz Chem.- and Eng. News, November'25, 1945 Pp. 2070-2075. 

6. THE METHOD OF CONTROLLING FUNGUS ON PLANTS WHICH COMPRISES CONTACSTING THE STEMS AND FOLIAGE OF THE PLANTS WITH A FINELY-DIVIDED MIXTURE OF 5-CHLORO-2-HYDROXY-A(TRICHLOROMETHYL)BENZYL ALCOHOL AND A SOLID INERT EXTENDER. 